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#1
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Help
the balancer was bad on my son's car. while trying to get it loose
the bolt decided to break off in the crank. what can i do ?? |
#2
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It is possible to ge an easy out big enuff. But I don't know if the size would ne correct for it.
The other problem is getting a drill bit large enuff for your hand held drill. |
#3
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....what?.......
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#4
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gettin' it out
you might try a lefthanded drill bit, it always works for me, just start drilling in the center, usua;;y with the load removed, the bit just grabs the bolt and turns it right out!!
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#5
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if the left handred drill bit doesnt work i'd go ahead and get a heli coil for it and drill it out. Easy outs might work but if the extractor breaks off inside your FARKED. They are made of carbide and no drill will drill out a busted easy out so ya might try the easy out first but if she doesnt wanna budge dont put the vulcan death grip on it cause if the extractor breaks the crank will prolly be trash.
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#6
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In a worst case situation, the bolt is made of softer metal than the crank. That being the case, it can be hit with a torch and melted out.
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#7
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thanx guys, the bolt appears to be hardened.
will a solid carbide bit drill it out ? |
#8
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carbide
yes, a carbide or carbide-tipped bit should do it, just go slow and use cutting fluid, try to still use a lefthanded bit tho
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#9
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Re: gettin' it out
Quote:
I would pull the engine and the crank,before I tryed melting the bolt. As that much heat would not do the cranks temper any good. Along with the timing gear and chain. |
#10
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If the lefty drill bit doesn't work, though it should; here is a tip on using easy-outs. When you go to drill through the bolt, go ALL OF THE WAY THROUGH! If you don't, the tool will almost surely break. Also, choose the largest easy-out that will fit into the bolt without digging into the crank threads to get the bolt hull wall drilled as thin as possible. What this does is remove the load from the threads by allowing the bolt to "collapse" just enough for a little clearance. If you use the same type of bolt extractors as I do, it is beneficial to tap them into the hole with a very light rap from a hammer--that seats the extractor in the drilled bore of the bolt. Use light pressure, and if you feel the extractor slipping, back up and tap it in again. My last ditch effort is to use a small chisel or a bushing cutter to peel back one side of the bolt. Of course, the crank will have to have some cleanup work after doing that, but it is better than having to swap cranks. Be sure to use a proper harmonic balancer installer when you go back with your new balancer, and have fun if at all possible!
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#11
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You can weld a nut on the remaining part of the bolt and use a socket to remove it, but it would be better to have the engine out of the car and get somebody that can weld I use certanium 707 to do this operation if you want more info let me know. How deep in the hole is it or is it flush.
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#12
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thanx 4 tha replies and suggestions
i ended up using a solid carbide drill. drilled through it, opened it up with a carbide tool and was able to back the bolt out. no damage done and the boy is much happier. |
#13
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Crank Bolt Shaft
Since the bolt was stuck enough to snap, it will take some pressure to get it out. A torch melting it out sounds EXTREEM to me. I learned this years ago from a mechanic/machinest 25 years ago or more. Get someone that welds real good and place a large washer on the nose. Weld up from the bolt to the washer and then weld another bolt to the washer. Keep in mind, that the washer and bolt need to be Grade 8 or better.
Any machinest worth his sand can get it out. Just thinking out loud. |
#14
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Ha Demon im not far from wilmington. Just down 68 in Brown County.
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#15
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bolt
If it took enough torque to break it, it ain't coming out with easy out. Sorry, take the crank to a machine shop. In the end I think its the only way. The only other trick I know is this. Put a really big nut over the broken bolt. Use an arc welder to burn the nut to the broken bolt. Make sure it gets good and hot. Whack it out with an impact gun while its still hot. Put a new front seal. NOTE. Before doing this make sure the bolt in question is not left hand thread.
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#16
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Hey guys, if you read the last post from OhioDemon, you will see that he has already removed the broken bolt, from the crankshaft.
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